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Magnetocaloric properties of spheroidal La(Fe,Mn,Si)13H y granules and their performance in epoxy-bonded active magnetic regenerators

2020; Elsevier BV; Volume: 183; Linguagem: Inglês

10.1016/j.applthermaleng.2020.116185

1873-5606

Bernardo Vieira, Henrique Neves Bez, Michaela Kuepferling, Marcelo Augusto Rosa, Deise Schäfer, Cristiani Campos Plá Cid, Hugo A. Vieyra, Vittorio Basso, Jaime A. Lozano, Jader R. Barbosa,

Thermal Expansion and Ionic Conductivity

Magnetic cooling has been researched as an alternative near room-temperature refrigeration technology for the past two decades. However, one of its greatest limitations is the lack of materials which can be properly shaped for optimal thermal-hydraulic performance while maintaining a substantial magnetocaloric effect at moderate fields (i.e., between 1 and 2 T) and remaining mechanically (and chemically) stable. In this paper, we thoroughly characterized a commercially accessible La(Fe,Mn,Si)13Hy material (available as spheroidal granules), in terms of its magnetocaloric properties and thermal-hydraulic performance in an Active Magnetic Regenerator (AMR) device. The regenerator bed built from epoxy-bonded spheroidal particles endured dozens of hours of operation in AMR cycles without any noticeable degradation of their mechanical integrity, thanks to a comparatively larger α−Fe content and granule porosity. As for the magnetic cooling performance, the AMR reached zero-span specific cooling capacities as high as 300 W kg−1. A 1-D two-temperature approach AMR model predicted the performance data with average deviations smaller than 7% for the zero-span specific cooling capacity and 5% for the AMR pressure drop.